/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshQueryFunctions.h
Compute the interpolated Position (A*Vertex1 + B*Vertex2 + C*Vertex3), where (A,B,C)=BarycentricCoords and the Vertex positions are taken from the specified TriangleID of the TargetMesh.
static [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * GetInterpolatedTrianglePosition ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, int32 TriangleID, FVector BarycentricCoords, bool & bIsValidTriangle, FVector & InterpolatedPosition )